Rumpf Klemens, Granitzer Petra, Michor Herwig
Institute of Physics, Karl Franzens University Graz, Universitaetsplatz 5, A-8010, Graz, Austria.
Institute of Solid State Physics, Vienna University of Technology, Wiedner Hauptstr. 8, Vienna, Austria.
Nanoscale Res Lett. 2016 Dec;11(1):398. doi: 10.1186/s11671-016-1617-0. Epub 2016 Sep 13.
Magnetic nanostructures of two ferromagnetic metals have been combined within porous silicon, and the magnetic switching behavior of the resulting porous silicon/metal nanocomposite has been modified by varying the arrangement. The two magnetic materials are Ni and Co, whereas Co is the magnetic harder one. These "hard/soft" magnetic nanocomposites have been achieved by two different routes. On the one hand, double-sided porous silicon has been used whereas one side has been filled with Ni nanostructures and the other one with Co nanostructures. On the other hand, Ni and Co have been deposited within one porous layer alternatingly. The filling of the pores has been carried out by electrodeposition with varying the deposition parameters. In systems which offer two distinct slopes of the hysteresis curves due to the different saturation behavior of the two types of deposited metal, magnetic exchange coupling is not present. For samples which show smooth hysteresis curves exchange, coupling between the Ni and Co nanostructures seems to be present. The aim is to control especially the structure size of the soft and the hard magnetic materials and the distance between them at the nanoscale to optimize exchange coupling resulting in a maximum energy product.
两种铁磁金属的磁性纳米结构已在多孔硅中结合，并且通过改变排列方式改变了所得多孔硅/金属纳米复合材料的磁开关行为。这两种磁性材料是镍和钴，而钴是磁性更强的一种。这些“硬/软”磁性纳米复合材料是通过两种不同的途径实现的。一方面，使用了双面多孔硅，其中一侧填充有镍纳米结构，另一侧填充有钴纳米结构。另一方面，镍和钴交替沉积在一个多孔层内。通过改变沉积参数的电沉积来进行孔的填充。在由于两种沉积金属的不同饱和行为而呈现出两条不同磁滞曲线斜率的系统中，不存在磁交换耦合。对于呈现出平滑磁滞曲线的样品，镍和钴纳米结构之间似乎存在交换耦合。目的是特别控制软磁和硬磁材料的结构尺寸以及它们在纳米尺度上的间距，以优化交换耦合从而获得最大能量积。
